It happened on Christmas Eve, 48 years ago. Three men took turns reading from the first 10 verses of the Book of Genesis. They were nearly 250,000 miles away from Bethlehem, but since it was the night before Christmas, and there was no chimney from which to hang their stockings, the three astronauts inside the Apollo 8 capsule orbiting the moon thought it would be appropriate. So as Jim Lovell, Frank Borman and Bill Anders looked at the faraway Earth through the small window of the spacecraft, they read the verses: “In the beginning, God made the heavens and the Earth.”

Their distant-sounding voices from far beyond our atmosphere were broadcast live to the whole planet that night over radio and television. It was one of those moments that brought the world together, that helped us to see our common humanity…